Number of days available for climatic review
| Parameter | Jan | Feb | Mar | Apr | May | Jun |
| Tmax | 768 | 697 | 763 | 740 | 769 | 749 |
| Tmin | 769 | 696 | 771 | 743 | 772 | 746 |
| Duration of sunshine | 1 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 775 | 702 | 775 | 753 | 775 | 750 |
| Humidity/Visibility | 182 | 166 | 179 | 172 | 181 | 178 |
| Parameter | Jul | Aug | Sep | Oct | Nov | Dec |
| Tmax | 771 | 768 | 771 | 788 | 774 | 803 |
| Tmin | 774 | 769 | 772 | 791 | 774 | 803 |
| Duration of sunshine | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation | 775 | 779 | 781 | 804 | 780 | 217 |
| Humidity/Visibility | 183 | 181 | 200 | 203 | 204 | 211 |
Climate data is usually derived from meteorological data of a certain number of years. The actual number of recorded years may vary from only a couple to 50 years or more. The quality of climate data depends on the number of available recorded years. Fewer years means less reliable data. The standart-period for reliable climate data is 30 years. For example, the mean monthly temperature for, let's say January, would ideally calculated from a total number of 930 recorded January-days. However, the usual number of recorded days is much smaller. The table above shows the actual number of recorded days for every parameter measured. |
